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I would assume not only that you are not alone, but that any programmer with 10+ years under their belt feels the same way or is a glutton for punishment. The focus has shifted from crafting good code to a tech race ignoring the basics. Even those who focus on good code get lost in the spaghetti of "smell" and patterns.
In cryptography, a nonce is an arbitrary number that can be used just once in a cryptographic communication. It is similar in spirit to a nonce word, hence the name.
Which is a stupid fancy way of saying, your token isn't recognized!!!
As to the word "invalid," I have always tried to not use that word, ever since I started "real" programming in my 20's. There are better words: "incorrect", "unrecognized", "wrong", "you're a shmuck!" etc.